src/​examples/​cpp03/​multicast/​receiver.​cppsrc/​examples/​cpp11/​multicast/​receiver.​cpp
1 /​/​1 /​/​
2 /​/​·​receiver.​cpp2 /​/​·​receiver.​cpp
3 /​/​·​~~~~~~~~~~~~3 /​/​·​~~~~~~~~~~~~
4 /​/​4 /​/​
5 /​/​·​Copyright·​(c)​·​2003-​2022·​Christopher·​M.​·​Kohlhoff·​(chris·​at·​kohlhoff·​dot·​com)​5 /​/​·​Copyright·​(c)​·​2003-​2022·​Christopher·​M.​·​Kohlhoff·​(chris·​at·​kohlhoff·​dot·​com)​
6 /​/​6 /​/​
7 /​/​·​Distributed·​under·​the·​Boost·​Software·​License,​·​Version·​1.​0.​·​(See·​accompanying7 /​/​·​Distributed·​under·​the·​Boost·​Software·​License,​·​Version·​1.​0.​·​(See·​accompanying
8 /​/​·​file·​LICENSE_1_0.​txt·​or·​copy·​at·​http:​/​/​www.​boost.​org/​LICENSE_1_0.​txt)​8 /​/​·​file·​LICENSE_1_0.​txt·​or·​copy·​at·​http:​/​/​www.​boost.​org/​LICENSE_1_0.​txt)​
9 /​/​9 /​/​
10 10
11 #include·​<array>
11 #include·​<iostream>12 #include·​<iostream>
12 #include·​<string>13 #include·​<string>
13 #include·​"asio.​hpp"14 #include·​"asio.​hpp"
14 #include·​"boost/​bind/​bind.​hpp"
15 15
16 const·​short·​multicast_port·​=·​30001;​16 constexpr·​short·​multicast_port·​=·​30001;​
17 17
18 class·​receiver18 class·​receiver
19 {19 {
20 public:​20 public:​
21 ··​receiver(asio:​:​io_context&·​io_context,​21 ··​receiver(asio:​:​io_context&·​io_context,​
22 ······​const·​asio:​:​ip:​:​address&·​listen_address,​22 ······​const·​asio:​:​ip:​:​address&·​listen_address,​
23 ······​const·​asio:​:​ip:​:​address&·​multicast_address)​23 ······​const·​asio:​:​ip:​:​address&·​multicast_address)​
24 ····​:​·​socket_(io_context)​24 ····​:​·​socket_(io_context)​
25 ··​{25 ··​{
26 ····​/​/​·​Create·​the·​socket·​so·​that·​multiple·​may·​be·​bound·​to·​the·​same·​address.​26 ····​/​/​·​Create·​the·​socket·​so·​that·​multiple·​may·​be·​bound·​to·​the·​same·​address.​
27 ····​asio:​:​ip:​:​udp:​:​endpoint·​listen_endpoint(27 ····​asio:​:​ip:​:​udp:​:​endpoint·​listen_endpoint(
28 ········​listen_address,​·​multicast_port)​;​28 ········​listen_address,​·​multicast_port)​;​
29 ····​socket_.​open(listen_endpoint.​protocol()​)​;​29 ····​socket_.​open(listen_endpoint.​protocol()​)​;​
30 ····​socket_.​set_option(asio:​:​ip:​:​udp:​:​socket:​:​reuse_address(true)​)​;​30 ····​socket_.​set_option(asio:​:​ip:​:​udp:​:​socket:​:​reuse_address(true)​)​;​
31 ····​socket_.​bind(listen_endpoint)​;​31 ····​socket_.​bind(listen_endpoint)​;​
32 32
33 ····​/​/​·​Join·​the·​multicast·​group.​33 ····​/​/​·​Join·​the·​multicast·​group.​
34 ····​socket_.​set_option(34 ····​socket_.​set_option(
35 ········​asio:​:​ip:​:​multicast:​:​join_group(multicast_​address)​)​;​35 ········​asio:​:​ip:​:​multicast:​:​join_group(multicast_​address)​)​;​
36 36
37 ····socket_.​async_receive_from(37 ····do_receive()​;​
38 ········asio:​:​buffer(data_,​·max_length)​,​·sender_endpoint_,​
39 ········boost:​:​bind(&receiver:​:​handle_receive_from,​·this,​
40 ··········asio:​:​placeholders:​:​error,​
41 ··········asio:​:​placeholders:​:​bytes_transferred)​)​;​
42 ··​}38 ··​}
43 39
44 ··void·handle_receive_from(c​onst·asio:​:​error_code&·error,​40 private:​
45 ······size_t·bytes_recvd)​41 ··void·do_receive()​
46 ··​{42 ··​{
47 ····if·(!error)​43 ····socket_.​async_receive_from(
48 ····{44 ········asio:​:​buffer(data_)​,​·sender_endpoint_,​
49 ······​std:​:​cout.​write(data_,​·bytes_recvd)​;​45 ········[this](std:​:​error_code·ec,​·std:​:​size_t·length)​
50 ······std:​:​cout·<<·std:​:​endl;​46 ········{
51 47 ··········if·(!ec)​
52 ······socket_.​async_receive_from(48 ··········{
53 ··········asio:​:​buffer(data_,​·max_length)​,​·sender_endpoint_,​49 ············std:​:​cout.​write(data_.​data()​,​·length)​;​
54 ··········boost:​:​bind(&receiver:​:​handle_receive_from,​·this,​50 ············std:​:​cout·<<·std:​:​endl;​
55 ············asio:​:​placeholders:​:​error,​51
56 ············asio:​:​placeholders:​:​bytes_transferred)​)​;​52 ············​do_receive()​;​
57 ····​}53 ··········​}
54 ········​})​;​
58 ··​}55 ··​}
59 56
60 private:​
61 ··​asio:​:​ip:​:​udp:​:​socket·​socket_;​57 ··​asio:​:​ip:​:​udp:​:​socket·​socket_;​
62 ··​asio:​:​ip:​:​udp:​:​endpoint·​sender_endpoint_;​58 ··​asio:​:​ip:​:​udp:​:​endpoint·​sender_endpoint_;​
63 ··enum·{·max_length·=·​1024·};​59 ··std:​:​array<char,​·​1024>·data_;​
64 ··char·data_[max_length];​
65 };​60 };​
66 61
67 int·​main(int·​argc,​·​char*·​argv[])​62 int·​main(int·​argc,​·​char*·​argv[])​
68 {63 {
69 ··​try64 ··​try
70 ··​{65 ··​{
71 ····​if·​(argc·​!=·​3)​66 ····​if·​(argc·​!=·​3)​
72 ····​{67 ····​{
73 ······​std:​:​cerr·​<<·​"Usage:​·​receiver·​<listen_address>·​<multicast_address>\n​";​68 ······​std:​:​cerr·​<<·​"Usage:​·​receiver·​<listen_address>·​<multicast_address>\n​";​
74 ······​std:​:​cerr·​<<·​"··​For·​IPv4,​·​try:​\n";​69 ······​std:​:​cerr·​<<·​"··​For·​IPv4,​·​try:​\n";​
75 ······​std:​:​cerr·​<<·​"····​receiver·​0.​0.​0.​0·​239.​255.​0.​1\n";​70 ······​std:​:​cerr·​<<·​"····​receiver·​0.​0.​0.​0·​239.​255.​0.​1\n";​
76 ······​std:​:​cerr·​<<·​"··​For·​IPv6,​·​try:​\n";​71 ······​std:​:​cerr·​<<·​"··​For·​IPv6,​·​try:​\n";​
77 ······​std:​:​cerr·​<<·​"····​receiver·​0:​:​0·​ff31:​:​8000:​1234\n";​72 ······​std:​:​cerr·​<<·​"····​receiver·​0:​:​0·​ff31:​:​8000:​1234\n";​
78 ······​return·​1;​73 ······​return·​1;​
79 ····​}74 ····​}
80 75
81 ····​asio:​:​io_context·​io_context;​76 ····​asio:​:​io_context·​io_context;​
82 ····​receiver·​r(io_context,​77 ····​receiver·​r(io_context,​
83 ········​asio:​:​ip:​:​make_address(argv[1])​,​78 ········​asio:​:​ip:​:​make_address(argv[1])​,​
84 ········​asio:​:​ip:​:​make_address(argv[2])​)​;​79 ········​asio:​:​ip:​:​make_address(argv[2])​)​;​
85 ····​io_context.​run()​;​80 ····​io_context.​run()​;​
86 ··​}81 ··​}
87 ··​catch·​(std:​:​exception&·​e)​82 ··​catch·​(std:​:​exception&·​e)​
88 ··​{83 ··​{
89 ····​std:​:​cerr·​<<·​"Exception:​·​"·​<<·​e.​what()​·​<<·​"\n";​84 ····​std:​:​cerr·​<<·​"Exception:​·​"·​<<·​e.​what()​·​<<·​"\n";​
90 ··​}85 ··​}
91 86
92 ··​return·​0;​87 ··​return·​0;​
93 }88 }